Wikipedia:Reference desk/Archives/Mathematics/February 2012

= February 1 = Reference_desk/Archives/Mathematics/2012 February 1


 * 1) Determining probability quickly

= February 2 = Reference_desk/Archives/Mathematics/2012 February 2


 * 1) good introduction to abstract algebra from very basics
 * 2) Regular or partial (definite integral) notation (i.e., “d” or “∂”)?

= February 3 = Reference_desk/Archives/Mathematics/2012 February 3


 * 1) Isosceles right triangle
 * 2) Computing values for the Riemann zeta function
 * 3) PARTIALLY resolved?

= February 5 = Reference_desk/Archives/Mathematics/2012 February 5


 * 1) /3
 * 2) Name of 0
 * 3) Reduced residue systems

= February 6 = Reference_desk/Archives/Mathematics/2012 February 6


 * 1) Max Quad Area
 * 2) Category theory homework problem - subobject classifier and showing a morphism is self-inverse
 * 3) Does an adjective exist to describe this situation?
 * 4) t-test help please
 * 5) Froda's Theorem Flawed ?
 * 6) Maple advice
 * 7) Sums of unit vectors of prime factions of pi?

= February 7 = Reference_desk/Archives/Mathematics/2012 February 7


 * 1) Trains allegedly haul 1 ton for nearly 500 miles on a gallon. How to calculate?
 * 2) Angle bisector problem

= February 8 = Reference_desk/Archives/Mathematics/2012 February 8


 * 1) Problem solving : work backward
 * 2) Time lag in second-order positive feedback
 * 3) Value of infinite limit

= February 9 = Reference_desk/Archives/Mathematics/2012 February 9


 * 1) Unique Factorization Domain
 * 2) Offsetting an ellipse
 * 3) Stationary functions of a functional

= February 10 = Reference_desk/Archives/Mathematics/2012 February 10


 * 1) Minimum area of a quadrilateral
 * 2) modulo arithmetic
 * 3) Greatest Common Divisor of Two Polynomials
 * 4) Solving the 3-body problem if two of the objects are stationary
 * 5) Mercator latitude scaling

= February 11 = Reference_desk/Archives/Mathematics/2012 February 11


 * 1) Using mod (i.e. remainder after division) on complex numbers

= February 12 = Reference_desk/Archives/Mathematics/2012 February 12


 * 1) Preliminary tests for regression analysis in SPSS; ANCOVA in SPSS
 * 2) Division by zero
 * 3) 0/0=0^0?

= February 13 = Reference_desk/Archives/Mathematics/2012 February 13


 * 1) Exact solution to the Hénon map

= February 14 = Reference_desk/Archives/Mathematics/2012 February 14


 * 1) Number naming system
 * 2) RANSAC number of iterations
 * 3) Diophantine equations
 * 4) Planar graphs and coloring

= February 15 = Reference_desk/Archives/Mathematics/2012 February 15


 * 1) A Quick Proof
 * 2) Central tendency and usefulness of measurements
 * 3) Limit conditions
 * 4) Non-Standard Proof
 * 5) Spectral radius of a derivative

= February 16 = Reference_desk/Archives/Mathematics/2012 February 16


 * 1) drawbacks to riemann & riemann stieltjes integral
 * 2) Differential equations describing Euler's three-body problem

= February 18 = Reference_desk/Archives/Mathematics/2012 February 18


 * 1) Topological relationship between a sphere and a cone?
 * 2) Strange voting system
 * 3) 3y-2x=5+9y-2x

= February 19 = Reference_desk/Archives/Mathematics/2012 February 19


 * 1) Geometric algebra question: degrees of freedom to a k-blade
 * 2) describe conditions that would allow you to martingale
 * 3) f(1/x)

= February 20 = Reference_desk/Archives/Mathematics/2012 February 20


 * 1) Trig functions

= February 21 = Reference_desk/Archives/Mathematics/2012 February 21


 * 1) phi(n) question
 * 2) Statistics and entailment

= February 22 = Reference_desk/Archives/Mathematics/2012 February 22


 * 1) Radians and calculus
 * 2) Matrix Eigenvalues
 * 3) New method for long division
 * 4) Quadratic Eigenvalue Problem with Circulant Matrices
 * 5) Finding quadratic formula
 * 6) Curl

= February 23 = Reference_desk/Archives/Mathematics/2012 February 23


 * 1) Math Problem
 * 2) Trig function help
 * 3) Difference between a series and a progression
 * 4) Uniqueness of injective/flat resolutions
 * 5) Heart-shaped function
 * 6) MATH GESSUING
 * 7) Area enclosed

= February 24 = Reference_desk/Archives/Mathematics/2012 February 24


 * 1) Solids of revolution by cylindrical shells
 * 2) Length of the curve of any polynomial
 * 3) Question: limits of partially defined functions on the reals
 * 4) Products

= February 25 = Reference_desk/Archives/Mathematics/2012 February 25


 * 1) Integrating with the natural logarithm

= February 26 = Reference_desk/Archives/Mathematics/2012 February 26


 * 1) relating entropy ratchet to stock market fluctuations

= February 27 = Reference_desk/Archives/Mathematics/2012 February 27


 * 1) Logarithms
 * 2) How to reverse XORs
 * 3) U.S. income tax revenue
 * 4) Diophantine equations
 * 5) Calculating the equation of a line tangent to a circle that passes through a particular point

= February 28 = Reference_desk/Archives/Mathematics/2012 February 28


 * 1) differentiation operator "d" and partial derivatives
 * 2) Solutions to a transcendental equation
 * 3) Solving a differential equation using the Green's function
 * 4) Adding/subtracting sine waves of the same frequency